(1) ammonium chloride. This product can promote the secretion of trachea and bronchial glands by reflex through the receptors of gastric mucosa. Because serous acinus accounts for the majority in trachea and bronchial glands, ammonium chloride causes thinner secretion, which can dilute thick sputum and make it easy to cough up, and cover the inflamed bronchial mucosa surface, so that the mucosa is less stimulated, thus reducing cough. It is suitable for the early stage of bronchitis, especially for cough with dry mucosa and thick phlegm. In addition, ammonium chloride has diuretic effect. Usage and dosage: Take orally, .2 ~ 1g, 2 ~ 3 times a day.

(2) potassium iodide. Part of this product is excreted from respiratory gland after oral administration, which stimulates respiratory mucosa, increases gland secretion, dilutes sputum, and is easy to cough up, showing expectorant effect. However, this product is highly irritating, so it is not suitable for the early treatment of acute bronchitis. It is mainly suitable for the treatment of late subacute bronchitis and chronic bronchitis with thick sputum that is not easy to cough up. Usage and dosage: Take orally, .2 ~ 1g, 2 ~ 3 times a day.